Calculating mechanism



Feb. 20, 1940. 'H. J. FURBER CALCULATING MECHANISM Original Filed Oct. 3, 1955 4 Sheets-Sheet 1 Feb. 20, 1940.

H ,1. FURBE'R CALCULATING MECHANISM Original Filed Oct. 3, 1935 4 Sheets-Sheet 2 mum hw kku mu 4 Sheets-Sheet 3 H. J. FURBER CALCULATING MECHANISM Original Filed Oct 3, 1935 Zhwentor AAA Feb. 20, 1940.

Feb. 20, 1940. H. J. FURBER CALCULATING MECHANISM 4 Sheets-Sheet 4 R. o m .M E V m M J W 5 a 1 SR m m HL Raw d w. MN m a m a u o ATTORNEY.

Patented Feb. 20, 1940 UNITED STATES PATENT OFFICE CALCULATING MECHANISM Henry Jewett Fnrber, Washington, D. 0.

Original application October 3, 1985, Serial No. 44,159. Divided and this application June 15, 1938, Serial No. 85,359

9 Claims.

0 transmitted in additive accumulation, whether the operation be within the zone of positive quantities, or within the zone of negative quantitles; and cyclic first step transfer shall be ef-' fected both when a positive quantity be subtracted from a positive quantity, and when a negative quantity be subtracted from. anegative quantity.

Another object of this invention is to provide improved means whereby, during the first step of the computing apparatus from zero position, the transfer mechanism shall be automatically conditioned for cyclic tenth step transfer in additive operations and for cyclic first step transfer in subtractive operations, whether the operation be within the zone of positive or of negative quantities.

Another object of this invention is to provide improved means whereby in passing through zero from the zone of positive into the zone of negative quantities; or vice versa, as for example, in the subtraction of a larger subtrahend-from a smaller minuend, the cyclic phases of transfer shall automatically be varied; so that the minuend having been reduced to zero by subtractive first step transfer, the remainder of the subtrahend shall be accumulated by additive tenth steptransfer.

Another object of this invention is to provide automatic means selectively to eliminate such transitional carryover as may be developed at various orders of the computing apparatus, in operations passing from the zone of positive into the zone'of negative quantities, or vice versa.

Additive accumulation by cyclic tenth step transfer, is, in earlier types of calculating apparatus, restricted to positive quantities; negative quantities being additively accumulated by cyclic first-step transfer. This is obstructive to subtractive operation on negative quantities, in which, as in division or in the extraction of a radical, the reduction of the quantity to zero or to a negligible remainder is required. It is an object of this invention to remove such limitation, by improved means whereby, whether within the zone of positive or of negative quantities,

identical forms of computation may be performed in identical transfer phases.

The numbering and lettering of my copending application No. 44,159 are preserved herein. Suf flcient of the mechanism therein disclosed, is reproduced in the present application, to illustrate transfer in addition and subtraction, although not restricted to these operations.

With the foregoing and other objects inview,

as will appear, I now describe my invention in 10 connection with the accompanying drawings, in which:

Figure 1 is a diagrammatic view of, calculating apparatus embodying this invention, adapted to u addition and subtraction.

Figure 2 is a diagrammatic plan view} showing the transfer mechanism with electrical connections.

Figure 3 is a view from the left of a disk 63a with electrical connections, which selectively condition the phases of the transfer mechanism.

Figure 4 is a view from the right of a timing arm I8, and electrical connections, which arrest operation of accumulator arms 6|, 6|", 6|"', shown in Figure 1 at predetermined stages.

Figure 5 is a view from the right of transmission from shaft 53 to shafts 58, 58a, shown in Figure'2.

Figure 6 is a view from the left of a typical disk 62' with electrical connections operative in restoring to zero position the members of a dencminational order.

Figure 'l is a view from. the left of a disk 69, which controls circuits to the clutch C6 shown in Figures 1 and 2, when clearing apparatus.

Figure 8 is a diagrammatic view partly in section, of selective compensating mechanism, which modifies transfer in transitional operations.

Figure 9 is a view from the right of a timing wheel 16, which closes at predetermined phases circuits to the compensating mechanism.

Figure 10 is a side view from the right of a typical accumulator arm 6|, shown in Figure l, with electrical connections.

Figure 11 is a view of mechanism employed in recording resultants and the quality thereof.

' Figure 12 is a perspective view from the right illustrating the pathway of the timing arm 18,

1 shown in Figures 1 and 4, when closing circuits throughout.

' Cables carrying a plurality of wires are identified Arrows indicate direction. Di-' All wheels disclosed in figures are toothed There are no mutilated gearings.

GENERAL DESCRIPTION The quantities subject to operation may be transmitted to the calculating unit (Figure 1), by means of electric circuits controlled by the manual levers l', I", l', or by equivalent devices. A master switch I which selectively closes circuits presently described is placed at to cause the accumulator arms to operate in positive direction; and at to cause the accumulator arms to operate in negative direction the nature of the operation which shall be performed. The depression of the push button P.|, initiates transmission of motion from an electric motor M, preferably in constant operation and revolving always in the same direction, to the accumulator arms 6|, 6|", 6|"' (Figures 1, 10, and 11), which are elements respectively, in denominational orders of the apparatus and correspond to hundreds, tens and units. Motionis further communicated by the motor M to a progressively movable switch or timing arm 18 (Figures 1, 4,)

which measures the movement of the accumulator armslii', 6|", 6V", and arrests them at angles of displacement corresponding to quantities selected at the manual control levers i, i",

The relays C.|i C.|2-(Figure 1) control the direction of motion transmitted to the accumulator arms 6|, 6|, 6|"', from the motor M, c onsistently with the nature of the mathematical operation, and the positive or negative qualities of the quantities involved.

The timing wheel 76 (Figures 1, 9) closes and breaks circuits through conductors which it carlies, in such selective order, as to bring the members thereby afiected into operation in their proper turn.

The items or the resultants latent in the accumulator and reflected at the arms 6|, 6|", 6|"' are indicated at recording mechanism shown in Figures and 11, and presently described, the accumulator arms each closing step by step in its angular displacement, circuits progressively corresponding to the numerals 0-9 (Figure 10).

The motor M connected through wires s+, swith the source 22 (Figure 1), imparts motion through the shaft 50, wheels 5|, 52, shaft 53 (Figures 1, 5), wheels 54, 55, 56, and, in addition of positive quantities, through the gear 51 and clutch C.5, to the shaft 58, on which are loosely mounted the sleeves 6|)", 6|)", 60", carrying respectively, the accumulator arms 6|, 6|", 6|"', which collectively, together with transfer mechanism, are termed the accumulator. In subtraction of positive quantities, motion is transmitted from the wheel gear. 56-, geared armature 51a and 'clutch 0.5a to the shaft 58a, and thence through the wheels 59a, 59, to the shaft 58 (Figures 1, 2, 3). The wheels 59a, 59 are fixed respectively upon the shafts 68a, 58, and are continually in mesh.

Motion is selectively transmitted to the sleeves 60', 66", 66", by the electric clutches C.|, C.'l", C.'|" which are flxed to the shaft 58. The sleeves 66', 6|), 60", are loosely mounted on the shaft 58. The armature 62' is integral with 5 the sleeve 60'. The armature 62" floating on shaft 58, transmits motion to the sleeve 6|)" through the composite idler 6'!" floating on the pivot 65", and through the differential gearing Df", the middle member 01' which is integral with the sleeve 66". The armature 62' floating on the shaft 58, imparts motion to the sleeve 60',

' in similar manner, through the composite idler 61' and the difierential gearing Df. The differentials Df, D!" are introduced, in order that the accumulator arms 6|, 6|", may be responsive, each to quantities originating in its own denominational order while simultaneously absorbing carry over from orders therebelow.

The manual controls comprise the levers (Figure 1) corresponding respectively to the denominational orders, hundreds, tens and units.

The master switch 1, pivoted at 1',-is provided with conductors 9, l2, which, according to the position in which the master switch be manually placed, close circuits that condition the apparatus selectively for the operation which is to be performed. S0 closed, in addition of a positive quantity, is circuit of the wire a (Figure l) to the timing arm I8, as follows: ZZ, s+, l2, a, terminal 19 progressively closed, as presently described, to the numeral wires b'b, for exam-- pie to I2 selectively closed by lever i to 0', CA, s, ZZ. Circuits of said wires b'b may be selectively and simultaneously closed by any one or more of said levers I", thelever I",

closing circuit from said wire 17 for example, to

wire 0" to CA", s, ZZ; and the lever closing circuit, for example, 01' said wire b to c' to C.4"', s, ZZ. Closed likewise by master switch (Figure 1) when in positive position, is circuit of the wire dr to the clutch 0.5, as follows: ZZ, s, 9, dr, bridged at 98 to C.5, h bridged at I61 (Figure 1) and one or more bridges I2, 12'', 12" to 8+, ZZ. The clutch 0.5 revolves the accumulator shaft 58 (Figures 1, 2, and 5) and arms 6|, 6|", 6|"' clockwise, see arrow (Figure 5). The master switch 1, when placed in negative position closes the circuit of the wire a above described; and closes further to the relay CA2, circuit of the wire dr as follows: ZZ, s, 9 dr to C.|2, s+, ZZ. Master switch 7 in negative position also closes circuit of the wire 1', to the relay 0. as follows: ZZ, s+, l2, i bridged at ||l| to C.| i, s, ZZ. 80 energized the relay 0. closes at bridge 99 circuit of dr to the clutch C.5a, which said circuit is ZZ, s, 9, dr bridged at 99 to 0.5a, h bridged at I61 (Figures 1 and 2), and at one or more bridges I2, 12', 12' to 8+, ZZ. If the levers I be active, the said circuit of wires dr and of h is closed at the respective bridges 12'', 12', in like manner to s+, ZZ. The clutch 0.5a, energized thereby, transmits motion in contraclockwise direction, through 58a, 59a, 59, to the accumulator shaft 58 and arms 6|, 6|", 6|"'.

quantity to a negative quantity, the master 16 switch I is placed at In the addition of a negative quantity to a positive quantity the master switch I is placed at In the subtraction of a negative quantity from a positive quantity I the master switch 'Iis placed at In the subtraction of a positive quantity from a negative quantity the master switch 1 is placed at the signs and at the member 'I, signifying posilo tive and negative direction.

theshafts 3, 3", 3", are the cams l, l, 4", which, in normal position support the bridges 5, 5", 5". Deflection of the levers I, I", I, releases their corresponding bridges, which falling, close circuits respectively, over the wires e, e, e', to the relays 0.2, 0.2, 0.2. These relays, so energized close at bridges I3, 13", 13 circuit to the clutches 0.1, 0.1", 0.1, which transmit motion, respectively to the accumulator arms 6|, SI, SI.

Fixed on the motor shaft 50, is the clutch 0.2!, which, when energized, transmits motion through the armature I4, pivoted in solidarity with the pinion IS on shaft 50, to the timing wheel I6 fixed to' the shaft 11, together with the timing arm 18 (Figures 1, 4).

The timing arm. 18 synchronizes in movement with the accumulator arms 6|, 6|", BI, moving, for example, through an arc of 3.6, while an accumulator arm moves a unitary step of 36.

The accumulator arms 6], GI, GI, when set in motion, are respectively, arrested at angles of displacement determined bythe manual levers I, I, I'. Leading from terminals at the bench 80" (Figure 1) on which wire a may be closed by the timing arm I8, are the wires b -b corresponding to the numerals 1 to 9. These wires are shown as carried in the cable bb, and as severally extended past all the levers I,

II! I!!! v According to the angles at which such levers be deflected, selected b circuits are closed on the wires c, c, to the relays 0.4, 0.4, 0.4". Let lever I, wire 0 and the relay 0.4, serve as an example. If the quantity involved in an operation be 3; the lever l", corresponding to the units order, is manually deflected so that the wire I) is closed on the wire 0 ,to'the relay 0.4. It is the function of the relay 0.4, when circuit be completed at the revolving timing arm I8 (Figures 1, 4), through the wires a, b 0, to retract its plunger and break at bridge 10 circuit to the relay 0.2, causing this latter relay to release its plunger and break circuit to the clutch 0.1". Motion of the sleeve 60 and of the accumulator arm 'BI is thereby arrested, at an angular displacement corresponding to three units, and closes circuit to recording mechanism presently described (Figures 10 and erated, are similarly arrested through action of the relays CA, 0. which break circuit respectively, at bridges it, it, to the relays 0.2, 0.2".

The timing arm l8 (Figures 1, 4) carries a conductor i9, which, in its orbit, may close circuit of the wire a progressively to the wires b b (Figures 1, f.) terminals of the b wires being so spaced, at movement of the timing arm I8 to one cen another of the terminals of the h wires, c :responds to a unitary step displacement or" an accumulator arm 6%, M", M. The pathway of the arm I8 in so closing circuit to the terminals of Wires 19 -47 is shown in Figure 12.

Fixed together with the levers I, I", I, on'

11). The accumulator arms 6|, 6i", when 010- The terminals of the wires b'-b', as shown in Figure 4, are recurrent in successive groups; in order to obviate the necessity of restoring the timing arm I8, at the beginning of each new operation, to the perpendicular position shown as normal in Figures 1, 4. and 12. Between each two said successive groups of b b terminals, is a vacant space corresponding to zero, from any one of which the timin arm I8 may enter a new operation of addition or subtraction, the single typical group of 21 -42 terminals shown in Figure 1, being otherwise suificient, completely to illustrate the operation of the timing arm I8 and contact 19. The step displacement of the accumulator arms, coincide accordingly, with the serial number of the b wire or wires closed at the levers I, I", I. It thus appears that the movement of the accumulator arms SI, SI", BI respectively, is provoked by circuits through the wires e, e, e, to the relays 0.2, 0.2, 0.2; and is arrested by circuits closed through the wires 0, c, c', to the relays 0.4, 0.4, 0.4, when the timing arm 18 reaches the terminals of the b wire or wires closed at the levers I, I, I.

In order that it be not necessary to restore the timing arm 78 to normal perpendicular position, as shown in Figure 4, at the conclusion of each operation, terminals of the 11 wires are recurrent throughout the orbit of the conductor 19, a zero space separating each series, at any of which an operation may begin.

Addition Assume, as an example, that the quantity 232 be transmitted to the accumulator arms 6|, 6|, 6I (Figure 1) by an operation of addition. The levers I, I, I are closed respectively on the wires b b b Deflection of the levers closes at bridges 5, 5", 5", circuit to the relays 0.2, 0.2, 0.2. The master switch I is placed in position closing the positive wire a to the timing arm I8 and the negative wire dr over bridge 98 at the relay 0. to the clutch 0.5. The relay 0.I I remains deenergized in the addition of positive quantities. Levers and master switch having been adjusted, the push button P.I is momentarily depressed, imparting through the wire 9 an initial impulse to the clutch 0., and over the bridges l9, l9", 49",,

to the relays 0.2, 0.2, 0.2", which are then held in stick by circuit s+, closed over the bridges II, 12, at relay 0.2 and corresponding bridges at relays 0.2, 0.2. The circuits so closed originate at the source ZZ and extend through the wire s, bridges 5, 5, 5", wires e, e, e', to the negative poles of the relays 0.2, 0.2, 0.2", and from their positive poles, through the wire 8+, back to the source ZZ. The relays 0.2, 0.2, 0.2, when severally so energized, close at the respective bridges I3, 73'', 13", circuits to the clutches 0.1, 0?", 0.1", respectively and serially as follows: (1) Source ZZ, s+l3', a", 0i, s, 22; (2) Source ZZ, s+, l3", 0.1", s-, source ZZ; and (3) Source 22, 8+, 73', 9", 0.7", s-, source 222. Closed likewise by the relays 0.2, 0.2, 0.2 at the bridges l2, i2", 12 are circuits to the clutch 0.5 respectively and serially as follows: (1) 22, 5+, 12, h bridged at it? to 0.5, d1 bridged at 38, to 9, s, 22; (2) 22, 3+, '52, h bridged at iii! to 0.5, dr bridged at 98 to 9, s, 22; and (3) ZZ, 3+, 52, h bridged at 86's to 0.5, dr bridged at 93 to 9, s, .22. So energized the clutch 0.5 imparts movement in clockwise direction to the shaft 58 Ill) over, the sum being 621.

and through clutches 0.1, 0.1", 0.1", to the accumulator arms 8!, 6!", 8!"'.

Depression of the push button P.!, transmits momentary impulse to the relay 0.23 and the clutch 0.2!. The circuit so closed at P.! is as follows: ZZ, s+ bridged at P.! to wire 9, 0.23, s-, ZZ. The relay 0.23 so energized as P.! is depressed, bridges to the clutch 0.2!, circuit of the wire g as follows: ZZ,'s+ bridged at P.! to wire 9, bridged at 0.23 to 0.2!, s, ZZ. This impulse brings into operation the clutch 0.2! which rotates the timing wheel 16 sufficiently to close through a conductor 8! (Figure 9) carried by the timing wheel 16, circuit of the wire a to the relay 0.23, which is thereby held in stick, and closes over its lower bridge circuit of wire a to the clutch 0.2!. The circuit so closed to 0.23 through wire a originates at source ZZ (Figure l) and extends through s+, l2, a, closed at 8! (Figures 1 and 9), and upper bridge at 0.23 to said 0.23, s, to ZZ. The circuit of wire a to 0.2!, is as follows: ZZ, s+, !2, closed at 8i and lower bridge at 0.23, to 0.2!, sto ZZ. The conductor 8! is of such amplitude that circuit to the clutch 0.2! is thereby sustained, until the termination of the operation, and the timing arm (Figure 4) reaches a neutral position between two series ofb terminals.

Rotation of the accumulator arms continues, until the timing arm 18, moving from a neutral position and carrying the conductor 79 (Figure 4) closes the wire a on a terminal of the wire I: closed through the levers l, l" on the wires 0, c, (Figure 1) respectively to the relays 0.4, 0.4", the negative poles of which are connected through the wire 8- back to the source ZZ. The relays 0.4, 0.4", so energized break at bridges !0, 10, respectively, circuits e', e'", to the relays 0.2, 0.2", which break circuit to the clutches 0.1, 0.1", and arrest the accumulator arms 6!, 6!'", at a displacement of two steps,

corresponding to the wire I) and the first and last digits of the quantity 232. Circuits still being closed at the relay 0.2", to the clutches 0.5, 0.1, the accumulator arm 8!" continues to rotate until the timing arm 18 carries the conduc- -tor 19 to the terminal of the wire 11 where circuit is closed from the wire a through the wire b3 closed by the lever to the relay 0.4", which in turn breaks circuit 6', to relay 0.2". Circuit is thereby broken to the clutches 0.1", 0.5, the accumulator arm 6!", being arrested at a three step displacement, corresponding to the second digit of the quantity 232. The circuit of the wire 71. now being open, clutch 0.5 ceases to rotate the shaft 58.

Assume that to the quantity 232 entered at the accumulator, 389 were added in manner above described, levers I, I", closing respectively on the wires b b b and the push button P.!,

being again depressed. This would involve carry Under conditions assumed, as later will be more fully described, circuit is closed at the relay 0.25 (Figures 2, 3) on the wire d which leads to the clutches 0.8",

0.8" integral respectively with the sleeves 6D",

which carry the accumulator arms 6!",

98 which is =rotated to close at its respective extremities circuit of 3+ to wire d or d'. Carried by the clutches 0.8", 0.8 are contactbands 36", 36" so placed relatively to the terminals of the wire d, that the clutches, 0.8", 0.8, re- 4 The circuit closed to the relay 0.25 (Fig-- volved clockwise by shaft 58 in the addition of positive quantities (see arrow on member 51, Figure 5) are energized at each tenth cyclic step; and clutching their respective armatures 63", 83" (Figures 1 and 2) floating on shaft 58, transfer, during each such tenth step, additive carry over to next higher denominational orders. The armatures 63", 63'" are provided at their peripheries with spur gears, to operate transmission presently described. The circuit closed at said contact band 36 to 0.8" (Figure 2) is as follows: ZZ, 8+, 9!] closed on wire d (Figure 3) bridged at 92 to 36", 0.8, ds, lower bridge at 0.!9, s, ZZ. The circuit closed at said contact band 38 to 0.8" is ZZ, s+, 9!) closed on wire d (Figure 3) bridged at 92 to 36'" (Figure 2), 0.8", (18-, lower bridge at 0.!8, s, to ZZ. The clutch 0.8 of the tens order transmits carry over (Figure 1) to the hundreds order for example, through 63", 64, 65', 66 to D the left hand member whereof floats on, and the middle member is integral with the sleeve 68' which carries the accumulator arm. 6! of the hundreds order. Transmission from the units order to the tens, is

similarly effected through transmission 63,'

64", B5", 66", Di" and sleeve 68". In present example, 232+389=62l, the accumulator arm 6! performs a complete revolution, transmitting carry over to the tens order; and is arrested at a net displacement of one step. The accumulator arm 6!" advanced eight steps, plus a carry over, transmits a carry over to the hundreds order; and is arrested at a net displacement of two steps. The accumulator arm 6!, is advanced three steps plus carry over; and is arrested at a net displacement of six steps. The resultant entered at the accumulator is thus 621.

The wire 11 leading to the contact bands 36", 36', remains active, as presently explained, so long as operations remain within the zone of positive quantities. When within the zone of negative quantities, the wire (1' is active. When the accumulator be at zero circuits of both wires (1 and d are open.

Subtraction In subtraction in positive quantities the same circuits are closed by the master switch 1, as in addition, and further, at the conductor !2, the circuit of the wire 2' which leads over the bridge !0! closed by the relay 0.!2 to the positive pole of the relay 0.!!, whose negative pole is connected through wire 8- back to the source ZZ. The circuit closed to relay 0.!! is ZZ, 5+, !2, i bridged at !8! to 0., s-, ZZ. The relay 0.!! so energized switches at bridge 99, the circuit dr to the clutch 0.512. The circuit to the clutch 0.5a, is ZZ, s, 9, dr bridged at 99 to 0.511, h bridged at !6'! and a bridge !2', 12", 12" to s+, ZZ. Motion is transmitted through shaft 58a and wheels 59a, 59 (Figures 2, 5) in contra-clockwise direction to the shaft 58 and thereby to the accumulator arms 6!, 6!, 8!"'. The operation of levers l, I", of the push button P.!, and of the timing arm !8 moving in unchanged direction, remains as in addition.

Were the minuend 574, for example, set up at the accumulator 6!, 6 6 (Figure l), and the quantity 232 again set up, as hereinbefore described, at the levers I, I", to serve now as a subtrahend; the accumulator arm 6! would be reversed two steps by motion transmitted from the motor M through the coils 0.5a, 0.1; and be arrested at a net displacement of three steps, when the timing arm I8 (Figures 1, 4) reaches,

J8 closes on the terminal of the wire I), is reversed two steps and rests at a net displacement of two steps. The remainder at the accumulator 6t, 6t, tl' would accordingly be 342.

Movement oi the timing arm '58 is maintained, as in addition, until it reaches a neutral position between two series of 3; terminals.

Transfer mechanism shafts to, tile (Figures 1, E) are rotated simultaneously as hereinbelore described. The shalt 5?, carries the accumulator arms Gil, til, d together with the clutches (3.3", (3.8, which transfer carry-over. The mechanism carried by shaft is a circuit controller; and will be designated. by this term, in iollowing pages, clearly to distinguish it from the accumulator carried by shalt The said circuit controller is provided with transfer mechanism; and its purpose is, as presently described, solely to com ditron the transfer phases of the accumulator, that the clutches Q6", 3.8, which transfer ad ditively a carry over or positive quality during each cyclic tenth step and transfer subtractively a denominational unit of positive quality during each cyclic first step, when operating within the zone of positive quantities, shall, to similar efiect,

additively a carry over of negative quality during each cyclic tenth step and shall transsubtractively a denominational unit of negative uality during each cyclic first step, when operating within the zone or negative quantities. In Figure 2, the shafts 58, 58a are shown in plan view. Li Figure 3., they are shown with the shaft 58d largely obscured. In Figure l, the clutch Clio and armature 53a at the extremity of the shalt 58c, appear with the shaft 68a broken, to distinguish shalt etc from the shaft 58.,

The shaft 58a (Figure 2) carries the sleeve 6011,, We", fiilc' or the circuit controller which are rotated. respectively by the clutches Gila, 6.1a, Cla as the sleeves 60', fill", fill of the accumulator, carried by the shaft 58 are rotated by the motor M through the clutches 0.1, Cl", 03, Circuit is closed simultaneously at the bridges l3, lilo, respectively (Figures 1, 2) through the wires 9", do, to the clutches (3. 1, Clo. Circuit is closed simultaneously at the bridges l3, 73c", through the wires 9'", g'a to the clutches Cfl", CJo", and circuit is closed simultaneously, at the bridges 53, 130/, through the wires :i', 511", to the clutches Cfl'", Cfilci. The circuits so closed to Cl, CJ", Cil' of the accumulator, have been already traced. The circuits to the clutches 0.1a, Clo", CJa' of the circuit controller are as follows: Circuit to Clo is 22, 8+ bridged at 13a (Figure 2) to in, 0.1a, s, to ZZ. Circuit to 0.1a" is 22, s+ bridged at 13a" to ac", 0.1a", sto ZZ. Circuit to Cfla is ZZ, s+ bridged at 73a to y'u', 0141", s, to ZZ.

The armature of the clutch 0.1a is the wheel 6211' which floats onshaft 58a and transmits motion to the sleeve 60a, through a composite idler not shown but similar to the idler 61' (Figure 1) and the difierential DJa (Figure 2) the middle member of which is fixed to the sleeve at The armature of the clutch 0.1a" is the wheel 62a",

which floats on the shaft 58a and transmits motion to the sleeve 80a" through a composite idler similar to idler 61" (Figure 1), and the difierential Dfa" (Figure 2), the middle member of which is fixed to the sleeve 60a". The armature of the clutch CJa' is the disk 62a' fixed to the sleeve cow".

The carry-over, at the circuit controller on shaft 58a, is transmitted from the sleeve 6611" to the sleeve Ella", by the clutch Cfia integral with the sleeve 66a the geared armature 6311' floating on shaft 58a and transmission similar to the pinion 64" (Figure l) pivot and the pinion 56 to the left lateral member or the ferential Did (Figure 2) which floats on the sleeve tile". The carry-over is like manner transmitted from the sleeve c" to the sleeve the, hy the clutch Cfic fixed to the sleeve cc", and transmission similar to the transmission tr,

5d, 6%, (Figure l), and the difierential Did (Figure 2), the left lateral member of which floats on the sleeve ido.

Integral with the sleeve Hid of the circuit con= trailer is a clutch Clio (Figures l, .2) similar to the clutches Cdd", 6.8a, which carryover to an order consisting of a single mem her, the armature see. This order is higher than the highest order or the accumulator and corresponds to thousands, in the present draw mgs. (Figures 2, 3) which controls duplicate circuits to the clutches Chm, (1301 628d of the circuit controller and, Cit", Cii or the accumulator, When circuit or the wire d is closed by the corn ductor 80; the relay (3.25 is energized by the cir cult Z25, 8+, 96, cl to (3.25, s, 52; and d bridged at 92' to do. When cl is closed by the conductor 98; the relay (3.25 is energized by the circuit Z23, s+, d to 3.26, s, ZZZ; and d is bridged at (92 to do. Said circuits (Figures 2 and 3) to the clutch 6.8a, are ZZ, s+, 96, rt, 92, do, 88a, Clio, s, Z2; and. secondly, ZZ, s+, 90, d, 92 do, 3861, 6.80;, s-, ZZZ Said circuits to clutch (3.80 are 22, 5+, lid, d, 92, do, 36c", Clio", ds-, lower bridge at Cit, s+, Z2; and secondly, ZZ, 5+, 9!), d, Hi do, 38o", Clio/ ds-, lower bridge at CA9, s, ZZ., Said circults to clutch C.8a"' are ZZ, s+, Elli, d, 92, do, 36W, C.8a", (18-, lower bridge at CA9, s, ZZ; and secondly, ZZ,.s+, 90, d, 82 dd, saw, C.8a", 128+, lower bridge at CA9, s, ZZ. Said circuits to the accumulator clutch (3.8" (Figures 1 and 2) are ZZ, s+, 9d, d bridged at 92 to 36", 0.8", ds-, lower bridge at C.i9, s, 22; and secondly, ZZ, 8+, 02', bridged at 92 to 38", 0.8, d8, lower bridge at CA9, s, ZZ. Circuits to accumulator clutch C.8", are ZZ, 8+, 96, d bridged at 92 to 36", C. 8", ds-, lower bridge at 0.19, s, Z2; and secondly, ZZ, s+, 90, d bridged at 92 to. 38", (1.8', ds-, lower bridge at C19, 8-, ZZ.

Only after an initial step displacement be completed in some order of the circuit controller at shaft 58a, is circuit of the wire (1 or d closed by the conductor 80 (Figure 3) to the accumulator clutches 0.8", 0.8 (Figure 2), and these said clutches may accordingly be displaced in either direction during said initial step at the circuit controller, without subtractive transfer from accumulator orders thereabove. The contact bands 36", 36", 38", 38", extend each through 36 of are less escapement at the terminals of wires d. d.

- In Figure 13 is shown the clutch C.8" which is typical of all the transfer clutches. Its armatransmits l The armature title carries a conductor til ture 63" is provided with two rims, one being a spur-gear which meshes with 84" (Figure 1); the other carrying ten notches into one of which, at each successive step of its displacement, the angular extremity of an electric positioning pin 0.9" enters, to correct overdraught; block one lateral member of the differential Di, when the other lateral member is alone in operation; and to insure precision in the transfer. 03'' is energized during transfer by circuit of the wire d or of the wire d. Circuit of the wire d, is ZZ, s+, bridged at 92" (Figures 1 and 13) and by the contact band 36" to 0.9", s, ZZ. Circuit of the wire d, is ZZ', s+, Sli bridged at 92 and by the contact band 38" to 0.9", s-, ZZ.

The terminals of the wires d, d are so placed relatively to the respective contact bands 36", 38" that when the clutch 0.8" is energized by circuit of the wire either it or d, Gt' withdraws against a spring, its plunger from the above said notches. Similar, or other types of positioning pins well known to the art, may be employed at other rotary members where .required.

When the circuit controller at shaft the is in zero position, and the circuit of wire neither :1 nor d is active; circuit is closed from the wire s+ directly to the wire do and its terminals at the transfer clutches 0.8a, 0.8a", Che (Figure 2). These terminals are so positioned, relatively to the contact bands 36a, 3611- 3611" fixed to said respective clutches and extending through 36 of arc less escapement from the terminals of wire dc, that at the initial step of a said clutch C.8a, 0.8a", CJW, contra-clockwise, (as in the addition at the accumulator of a positive quantity to zero) the said transfer clutch 0.8a, 0.8a", or C.8a", initially displaced, is energized by the circuit do and transfers subtractive carry over, which causes all said transfer clutches of higher order at the circuit controller to transfer subtractive carryover, displacing thereby the armature 63a to the position at which circuit of the wire at is closed through the conductor 90 (Figure 3) fixed to the periphery of said 63a. Said circuit of do to the clutch C.8a' (Figure 2) originates at the source ZZ and extends through wire s+, bridged at 92 depressed to da, 36a, 0.8a, sto source ZZ. The corresponding circuit to clutch 0.8a originates at source ZZ and extends through s+ bridged at 92' depressed to da, 36a", ds-, lower bridge at C.l9, s, to ZZ. The corresponding circuit to clutch C.8a" originates at source ZZ and extends through 8+ bridged at 92' depressed to da, 36a", 0.8a", ds-, lower bridge at CA9, s--, to ZZ. v Y

Likewise, when the circuit controller is in zero position, circuit of the wire (111', above traced, is closed to terminals cooperative with said clutches 0.8a, 0.8a", C.8a"' (Figure 2). These last said terminals are so positioned relatively to the contact bands 38a, 38a", saw", fixed to said respective clutches and extending through 36 of are less escapement from the terminals of wire do, that at the initial step of a said transfer clutch (2.80, 6.8a", C.8a"', clockwise (as when at the accumulator a negative quantity be added to zero), the said transfer clutch 0.8a, 0.8a" or C.8a"', initially displaced, is energized by the circuit of da', and transfers subtractive carry over, which causes each said clutch of higher order at the circuit controller, to transfer subtractive carry over and displace the armature 63a to the positionat which the conductor 90 closes circuit of the wire it. The said circuit of da' to the clutch 0.8a originates at the source l Z2 and extends through s+, bridged at 92 depressed to do, 38a, 0.8a, s-, to ZZ. Corresponding circuit to clutch 0.8a" originates at source ZZand extends through s+, bridged at 92 depressed to da, 38a", C.8a", (15-, lower bridge at 0.19, s-, to ZZ. Corresponding circuit of clutch C.8a"' originates at source Z2 and extends through s+ bridged at 92 depressed to da', 380/, C.8a"', 6.8-, lower bridge at C18, sto ZZ.

When the wire d is closed by the conductor 90, circuit ZZ, 3+, 90, d, C15, s-, ZZ is completed to the relay 0.25. The relay 0.25 so energized displaces the members 91, which likewise may be displaced by the relay C25 when energized and closes at the bridge $2 circuit through an extension of the wire it to the clutches 0.8, 0.8", the contact bands 36", 36' at which are so placed relatively to the terminals of the wire ii, that the clutches 0.3", 6.8 are energized during each tenth step displacement clockwise in every revolution, and during such tenth step displacement transfer additively a positive, carryover. At each first-step displacement in opposite direction within the zone of positive quantities the clutches 0.8", Ct, borrow. So long as the operation be within the range of positive quantities, the wire d is active.

When the wire d is closed by the conductor 90, circuit ZZ, 8+, 90, d, 0.25, s, ZZ is completed to the relay 0.25. The relay (3.25 so energized, closes at the bridge 92 circuit through an extension of the wire d to the clutches C.8", C.8", the contact bands 38", 383" at which, are so placed relatively to the terminals of the wire d, that the clutches 0.8", 0.8" are energized during every tenth step displacement in every revolution opposite to clockwise, and at such tenth step displacement transfer additively a negative carry-over. At each cyclic first step displacement clockwise, within the range of negative quantities, the clutches 0.8", C.8"', borrow. So long as the operation be within the 1 zone of negative quantities, the wire d is active.

Where the wire d is active, circuit is broken at the bridge 92 from the wire s+ to the wire da, which remains open, and is closed at the bridge 92' from the wire (1. through the wire dc to the clutches 0.8a.

When the wire d is active, circuit is broken at the bridge 92 from the wire 5+ to the wire da, which remains open, and is closed at the bridge 92 from the wire 11 through the wire dc to the clutches C.8'a, 0.8a", C.8a'.

'An initial step displacement as the circuit controller passes from zero position, into either positive or negative quantities, causes transfer subtractive carry-over, as above described, at the clutches 0.8a, 0.8a", C.8a, which displaces" the armature 63a. Conversely, as the calculating unit returns to zero position, through either positive or negative quantities, 'a last step displacement of a clutch C.8 a', 0.8a", C.8a", causes an additive carry-over to be transferred to the armature 63a, which is thereby restored to normal position, throwing the wires d, d and the clutches 0.8", 0.8" again into open circuit; and permitting the bridges 9|, 9| again to close circuit from the'wire s+,,through the wires both da and dc, to the clutches 0.8a, 0.8a", C.8a"'.

The transfer mechanism above described, is adequate and eflicient in operation within the range of quantities both'positive and negative,

provided the operation does not pass through zero from positive into negative quantities or vice versa. Should an operation so pass through zero complementary numerals become the measure of angular displacements and, transitional carry-over may occasion deficiency in denominational units reflected by members at shaft 58a, and an excess at shaft 58. This may be compensated as follows:

When, as previously described, the disk 63a is carried back to zero, the carry-over circuits do, do are both active at shaft 58oz; whereas, at shaft tilt, the carry-over circuits both 02 and d are open. The effect of this is, that at shaft 53o each lower order which passes through zero with disk effects a double subtractive transfer from the order next above; and, at'shaft each lower order omits an additive carry over to the order next above. in such event, above said deilciency and excess of transfer units, as presently described are both eliminated; and resultants are correct.

The several orders, all other than the hundreds order of the ci cuit controller at shaft 5%, may, however, not he at zero when the dist; 63a is carried through zero; or displacement not carry them thereto. in this event, such next higher order may be deprived of a required step displacement at shaft til-lo, measured in complementary digits, and at shaft 55 the displacement of the next higher order may he one step in excess. Examples:

(a) 1121-9992-8853. All orders pass simultaneously'through zero, at shafts both 5i circuit controller at shaft 58a is displaced proportionately to the numerals 998; and the accumulator at shaft 58 reflects the quantity 888. Resultant is correct.

it) 622-743 -l2l. The tens and units orders at both circuit controller and accumulator, pass zero before the hundreds order of the cir cult controller displaces the disk 63a. Members at shaft 58a are displaced proportionately to the numerals 121. Accumulator reflects the quantity 4231. Compensation is required to add a step to tens and hundreds orders at shaft 580., and to subtract a step from tens and hundreds orders at shaft 5%}.

(c) 1999ll=-712. At neither shaft is the tens and units order displaced to zero. Members at shaft 58s: are displaced proportionately to the numerals 712, the accumulator reflects the quantity, 8222. Compensation adds a step in the tens and hundreds orders at shaft 581:; and subtracts a step in tens and hundreds orders at shaft 58.

(d) 155l78=-323. The tens and unit order at both shafts, pass zero after the disk 63a; Members at shaft 58a aredisplaced proportionately to the numerals 323; and the accumulator reflects the quantity, 433. Compensation adds a step, at shaft 58a in tens and hundreds orders;

and subtracts a step in tens and hundreds orders at shaft 58.

(e) 342475=133. The tens order'at both shafts passes zero with the hundreds order of the circuit controller, and the units order before. Members at shaft 58a are displaced proportionately to the numerals 233, and the accumulator reflects the quantity, -143. A step is added to the tens order at shaft 58a, and is subtracted in the tens order at shaft 58.

(f) 537-675=-138. The units order is displaced to zero at neither shaft. At shaft 5811 the tens order passes zero with the hundreds order of the circuit controller. At shaft 58, the tens order passes zero before the hundreds. .At shaft 58a the members are displaced proportionately to the numerals 238. .At shaft 58 the accumulator reflects the quantity, 248. A step is added only in the tens order at shaft 58a; and a step is subtracted in both tens and hundreds orders at shaft 58.

Numerically similar positive remainders would be developed; were negative subtrahends and smaller negative minuends involved, the mechanisin then operating in reverse direction, the state-control it (Figure l), as hereinbeiore explained, be placed at to operate the accumu later in negative direction to accumulate a negative minuend; and being placed at to operate the accumulator in positive direction to subtract a negative subtrahencl from a negative minuend.

Required compensation is effected by severally displacing sleeves .65, to", Elia, cil a, together with the members fixedthereon, under the iniiuence of the solenoids Cfilb', Gilli; Gilli", Gil"; Cilia, Clio; Gilda", Cilia", arranged in pairs; relays Ctl, @333 which determine which solenoid of respective pairs shall operate; and the relays Gilt, @2159, fiiitc, little, which select the orders or the accumulator and of the circuit controller at which compensation shall be reflected.

Compensation is effected at sleeve tit (F ures 2, 8) by the solenoids Gilt, Gill; at sleeve oil", by the solenoids Gilt, Gill; at sleeve tits, by the solenoids Gilda, Cfl is, and sleeve tilts, by the solenoids time, Clio. in t1 e absence of decimal fractions, no compensation required at the units order, which accumulates no carry over.

The solenoids above designated are similar in action. The armature of each said solenoid termi nates in a latch which, when the solenoid is en ergized, operates on a ratchet Wheel fixed to the sleeve til, 56",tilo', Stat" of a corresponding order. Solenoids Clit', Gil, for example Figure 8), operate respectively on ratchet wheels tilt 305', rotating subtractively at shaft 58, the accumulator sleeve to of hundreds order in re spective opposite directions, according to the positive or negative quality of the denominational unit in excess. The solenoids Gilli, CJi", similarly subtract at the accumulator sleeve 66" of the tens order. Solenoids Cilia, Cilia add respectively, a denominational unit at the sleeve Sta in the hundreds order of the circuit controller; and solenoids Cilia", Clio" respectively, add at the sleeve 60a of tens order at the circuit controller, according to the positive or negative quality of the deficient units. In Figure 8 the ratchet wheels 305', 30511 are broken away showing the opposed positions of ratchet wheels 3M, 304a.

Since the defective carryover at each higher order originates at the order next below; compensation may properly be controlled by action 01 each such lower order on the order next above. Operation of the solenoids C10, CJI

(Figures 2 and 8) corresponding to the hundreds sition of the members in the units order of the accumulator. Similarly, operation of the solenoids 0.1911, CJIa corresponding to the hundreds order of the circuit controller, is determined by the position of members in the tens order of the circuit controller; and operation of the solenoids 0.1011", 0.1la corresponding to the tens order of the circuit controller, is determined by theposition of members in the units order of the circuit controller.

The solenoids CH, CH, CJla', 0.1m", are active only in operations which pass from the 'zone of positive into the zone of negative quantities; and the solenoids 0.19, 0.19", 0.1911, 0.19a", are active only in operations which pass from the zone of negative quantities into the zone of positive quantities. The solenoids 0.1!, 0.15", 0.1m, CJia" are conditioned by the relay 0.61, active in operations which originate within the zone of positive quantities; and the solenoids 0.19, 0.19, 0.1911, 0.1911" are conditioned by the relay 0.68, active in operations which originate within the zone of negative quantities.

The relay 0.61 (Figure 8) active in an operation originating within the zone of positive quantities, is energized by circuit of the wire d, closed as hereinbefore described as, for example in the accumulation of a positive minuend, when the conductor 96 closes on the wire 11. The circuit so closed to the relay 0.6? originates at the source ZZ and extends through s+, 99, d, bridged at 356' and 669 to 0.61, ds bridged at 12 and lower bridge at 0.!9 to s, to ZZ. The relay 0.61 so energized closes at bridge 399 raised, circuit of the wire s+ by which 0.6? then is held in stick. The last said circuit originates at the source ZZ and extends through the wire s+, 369, 0.61, ds, bridged at E2 andlower bridge at 0.59 to s--, ZZ. The relay 0.61 so held in stick, closes at bridge 3H1 circuit of the wire da, selectively closed by the relays 0.6912, 0.69111", 0.69, 0.69, at the respective bridges 3l2a', 3I2a'-, 312", 3l2, as presently described, to the solenoid 0.1la, 0.1111", 0.1!, 0.'II". The circuit so closed, to 0.'Ha, originates at the source ZZ and extends through 8+, 99, d, bridged at 92 do bridged at 3I0and'3l2a to Cilia, zc, conductor 315 (Figures 8 and 9), to s, to ZZ. The circuit closed to the solenoid 0.1la", originates at source ZZ, and extends through 8+, 99, d bridged at 92 do bridged at 3H), and 3|2a" to 0.1Ia, 2c, conductor 315 to s, to ZZ. The circuit closed to the solenoid 0.'II, originates at source ZZ, and extends through s+, 99, d bridged at 92 do bridged at 3) and 3|2 to 0.1!, 20, conductor 3|5 to s, to ZZ; and the circuit selectively closed to the solenoid 0.1!", originates at source ZZ and extends through s+, 90, d bridged at 92 do bridged at 3l9 and 3l2 to 0.1l", 2c, conductor M5, to s, to ZZ. If at the termination of an operation, the disk 6311 be at zero and circuit of the wire 11' open; circuit is closed by the conductor 99 from ZZ, s+, to the wire da and selectively, as above traced, to the solenoids 0.1la', 0.!la", 0.1l, 0.1!. In operations which pass from the zone of positive into the zone of negative quantities, the solenoids 0.'H, CJI" as presently described, efiect, as selectively required, subtractive compensation at the hundreds and tens orders, respectively, of the accumulator; and the solenoids CJIa, CJIa effect, as selectively required, additive compensation at the hundreds and tens orders, respectively, of the circuit controller at shaft 58a.

The relay 0.68 active in an operation originating within the zone of negative quantities, is

energized by circuit of the wire 11', closed as hereinbefore described, as for example in the accumulation of a negative minuend, when the conductor closes on the wire 11. The circuit so closed originates at the source ZZ and extends through s+, 96, d bridged at 3) and 309' to 0.68, ds bridged at 12 and lower bridge at 0J9 to s, ZZ. The relay 0.66 so energized closes at 399' circuit of the wire s+ by which it is held in stick, the last said circuit being, ZZ, 8+, 399, 0.68, ds bridged at 12 and lower bridge at 0.19 to s, ZZ. The relay 0.68, so held in stick, closes at bridge 3H) circuit of the wire da, se-- lectively closed by the above said relays 0.6911, 0.6911", 0.69, 0.69, at the respective bridges 3i3a, 3i3a", 3l3, 3l3, as presently described, to the solenoids 0.1011, 019a, C. 19', 0.19". The circuit so closed to the solenoid 0.1912, is ZZ, s+, 99, d bridged at 92 to do bridged at 339 and 35911 to 0.1%, 2,0, conductor 3l5 (Figures 8 and 9) to s, ZZ. The corresponding circuit closed to 0.1911" is, ZZ, s+, 99, d bridged at 92' to da bridged at 3H) and 31311 to 0.1611", 20, conductor 316 to s, ZZ. The corresponding circuit closed to 0.19 is ZZ, 8+, 96, d bridged at 92 to dabridged at .110 and EH3 to 019, so, conductor M5 to s, ZZ. Corresponding circuit to 0.?6" is ZZ, s+, 99, d bridged at 92" to da bridged at 3H) and 3l3 to 0.19", 20, conductor 3E6 to s-, ZZ. If at the termination of an operation the disk 6311 be at zero and circuit of the wire 11 open; circuit is closed by the conductor 90 from ZZ, s+ to the wire da and selectively, as above traced, to the solenoids 0.1911, 0.1%", 0.10, 0.19". In operations which pass from the zone of negative into the zone of positive quantities, the solenoids 0.19, 0.19 effect as selectivelyrequired, subtractive compensation at the hundreds and tens orders, respectively, of the accumulator; and the solenoids 0.1011, 0.7911" eifect, as selectively required, additive compensation at the hundreds and tens orders, respectively, of the circuit controller at shaft 5811.

To the sleeves 60", 60", 60a", 6011", are respectively fixed the disks 3|8", 3l8, 3l8a, 3I8a, provided with the conductors 3M, 39I, 3llla, 3llla, and the circular conductors 306", 306", 39611., 39611' (Figure 8). Initial displacement of any order of the circuit controller as said circuit controller passes from zero position displaces, as already described the disk 6311'. Such displacement causes the conductor 308 to close circuit of the wire s+ to the wire zd leading to the conductors 3M", 39l, 301a", 30la', and thence through the wires ze, ze, ze', 2e, respectively, to terminals at the relays 0.69, 0.69, 0.6911, 06911". An extension 211 of the wire 2d transmits an impulse over their lowest bridges to the relays 0.69, 0.69, 0.6911, 0.6911". In order that the circuit of the wire zd impart to the relays 0.6911, 0.6911", 0.69, 0.69"( only a momentary impulse, circuit of the wire ed to the last said relays, is broken at the bridge 3 or 3H, when the respective relays 0.61, 0.68, are energized.

Theabove said circuit (Figure 8) to the relay 0.6911, is ZZ, s+, 308, 2d, bridged at 3, 3H, and Mia, 0.6911, ds bridged at 12 and lower bridge at 019 to s-, to ZZ. Corresponding circuit so closed to 0.691;" is ZZ, s+, 398, ad bridged at 3, 3M, and 3lla", 0.6911", ds, bridged at 12 and lower bridge at 0J9 to s, to

ZZ. Corresponding circuit so closed to 0.69 is 22, s+, 308, ad bridged at 3, 3M, and 3H", 0.69, 118- bridged at T2, and lower bridge at 0J8 to "s, to ZZ; and corresponding circuit to 0.69 is ZZ, s+, 308, ad bridged at 8, 3H and 3| I", 0.69, ds bridged at 12 and lower bridge at 019 to s-, to ZZ.

The relays 069a, 0.69a", 0.69, 0.69., it the respective disks 3l8a, 3l8a, 3&8", 3W be not displaced as circuit of the wire ad is closed, are then held in stick by circuit through an extension of ad, namely, the wire ed closed by the conductors 301a, sow", 3M", tiii' fixed respectively to the disks 3l8a", 313m, 318", 3i8. The circuit so closed to 069a is 22, 8+, 398, ad, bridged at ltla", to ze bridged at lilla' raised, to 0.69s, dsbridged at it and lower bridge at Cid to s, to Z2. Correspond ing circuit to 0.69s" is 22, s+, 368, 2d bridged at 3080f to so bridged at Mia" raised to 0.59s", (15- bridged at 12 and lower bridge at 0%, to s-, to 255. Corresponding circuit to 0.59 is s+, e03, bridged at till! to ac bridged at i" raised, to 0.69, (18- bridged at it and lower bridge at 0.59 to s, to Z2; and corresponding circuit to 039 is 22, 5+, tilt, ed bridged at tili to so" bridged at Sli raised, to 0.69", 038- bridged at it and lower bridge at to 3-, to Z2.

If a dist: title", Siba', 358", 1H8 be displaced and circuit of the wire ed be broken at the respective conductors Bills", illlla, 22M, lllt', as circuit is momentarily closed to said several relays 0.6%., 0.6903", Ch li, 0.6a through the wire these said relays are nevertheless held in stick, through circuit closed by the respective conductors tilts", ttilia 3%", 336" at such of the disks 338a", 353a, 3M3", iHS as may be displaced. The circuits so closed to the respective relays 0.63501, 0.5903, 0.99, 015?? are as follows:

Circuit to the relay 0.5%, is 2%, s+, ilutaf, ee bridged at 35 to raised, 0.69s, dsbridged at it and lower bridge at 019 to s, to Z2. Corresponding circuit to 0.6% is 22, s+, 356c se bridged at Elia" raised, 0.690;, cisbridged at E2 and lower bridge at 0.3%? to s-, to 22. Corresponding circuit to 0.59, is ZZ, 3+, 398', so bridged at 3'6" raised, 0.559", ds bridged at E2 and lower bridge at 0.99 to s, to ZZ; and corresponding circuit to 0.59 is 22, 3+, 366, 2e" bridged at 3ii raised, 0.69, (isbridged at 52 and lower bridge at 019 to s, to

ZZ. Held in stick by circuit of s+, the relays 0.89, 0.69", 0.69s, 0.6911" close circuit at their bridges hi3", 3i3', 3I3a, Mia", on the exten-' sions of the wire da, leading respectively to the positive poles of the solenoids 0.10, 0.10", 010a, 010a". .At bridges 3H", 3I2, 3|2a, 3l2a c rcuit is closed on the extensions of the wire do leading respectively to the positive poles of the solenoids 0.1!, 0.1l, CIHa, CJIa. Quantities havng been accumulated, if subtraction follow, the relays 0.i9, 0.69", 069a, 069a", will all remain in stick until compensation be efiecteii; unless the operation pass through zero; in which event circuit will be broken to those of last said relays whose corresponding disks, 318", 3l8"", 3|Ba, 3l8a, chance to be at zero when circuit be broken by the disk 63a at conductor 308. For in such case current rails such relays from the wires both ed open at 308 and 5+ open at their corresponding circular conductors 30B", 305', 306a", 306a. The relays so deenergizedbreak circuit .on the terminal of the wire as.

of the wires da, do, to the respective solenoids 0.10, CJI', C.1II",C.H",C.10a,C.10a",C.1la",

which they control. The relays 0.89, 0.68" 059a, 0.69m", all operate to similar effect.

Example example, receives an impulse over bridge Mia" from the wire ed, and closes the bridge Ella" If the disk 3l8c be at zero; circuit is closed at the conductor tllla, from the wire ed to the wire as to 0.69s". If the disk 3l8a' be displaced from zero, circuit is closed by the circular conductor 3060,, at the terminals 3(lla', from the wire s+ to the wire so to 0139a. In either event the relay 0.694! is held in stick, closing at bridge 3l2a circuit of the wire 01a to the solenoid Cilia, and at the bridge Hts, circuit or the Wire do to the solenoid 0.10s". Assume that subtraction follows. If the operation pass through zero, the disk Gila breaks the circuit of the wire 2d at the conductor Silt. Should the disk illila then be at zero or should it pass to or from zero, while circuit of the wire act is open; current flows through the wire se to the relay 0.69s" neither from the conductor flllia closed on the open wire ed, nor from the wire 3+ which is open at the circular conductorilfifia The relay time" deenergized, breaks at bridge the" circuit of the wire do. to the solenoid 0150;", and at the bridge tide circuit of Wire do to the solenoid Cfiflc. With circuit oi the Wire se so broken at the units order to the relay 0529c", no correction is effected at the tens order by the solenoids Gillie", tllla. Should the disk titu not be at zero as the operation passes through zero and the dish Gila breaks circuit of the wire 2d, circuit remains closed ,to the circuit controller 069a" though the wire as from the circular conductor tiita. Gornpeusation by-the solenoid either Cite or Cilia" follows, accordingly as circuit do or do be closed by the circuit controller 0.57 or 0.68, as hereinloefore described.

Circuit of the wire do, closed by the relay 0.6'l which is thrown into stick by the circuit of wire d when an operation originates in the zone of positive quantities, becomes active only if the operation pass into the zone of negative quantities. Circuit of the wire do closed by the relay 0.68, which is thrown into stick by circuit of wire d when. an operation originates in the zone of negative quantities, becomes active only if the operation pass into the zone of positive quantities. Hence, unless a subtrahend be greator than the minuend and the operation pass through zero, neither the solenoids 0.10, 0.10", 010a, 010a in circuit of the wire dc, nor the solenoids 0H, 0.1!, CJla, Cflla in circuit of the wire da, will operate compensation. Should the relay 0.61 be active and the operation pass through zero, then the solenoids 0.1l', 0.11, Gila, C'Ha", to which circuit be completed by the relays 0.69, 0.69, 0.69a, 0.69a", through the wire do, efiect compensation. Should the relay 0.68 be active and the operation pass through zero in opposite direction, the solenoids 0.10, 0.10, 010a, 010a, to which circuit be completed by the relays 0.69, 0.69, 069a, 069a", through the wire da, effect compensation.

It is true that circuit of the wires both da, do are active, when the disk 66a be only carried back to zero and before it passes through. But the mathematical operation of subtraction will then have passed through zero, unless all orders be at zero. For an extra step displacement is required at the highest order, to carry the disk 63a back to zero, unless the lower orders of the circuit controller at shaft 60a, by reaching zero, have completed carry-over. Should the operation pass through zero and the disk 63a then rest at zero, compensation in the hundreds order of the circuit controller will displace the disk 63a through zero, renewing the circuits ad, ad, while closing, according to direction of displacement, circuit of the wire at or d, and conditioning, thereby, for subsequent transitional operation in opposite direction, the relay either 0.61 or 0.66 which may have been inactive during transition in a present operation.

At the timing disk 16 (Figure 9) the contacts 315 are recurrent and so placed at intervals of 36, that circuit from the wire s to the wire 20 be momentarily closed at the termination of each operation in subtraction or addition, as the disk 16 carries the timing arm 16 from a terminal of the wire I) to a neutral position between series of 11 wires (Figure 4).

The wire .20 energized as above, imparts, as the disk 16 revolves, a momentary impulse to the negative poles of the solenoids 0.10, 0.10", 0.1011, 0.10a", 0H, 0.11", 0.1la', 0.1la", bringing. those thereof into action to whose positive poles circuit be completed at the relays 0.61 or 0.68 and relays 0.60, 0.60, 0.6911,, 0.69s", through the wire do. or do.

Let it be assumed that, by one or a series or operations, a positive subtrahend, for example, be developed at the accumulator 6|, 6|", 6l'

, (Figures 1, 2), and that the relay 0.61 close circuit da operative on the solenoids 0.1 I a, 0.1Ia", 0.1l", 0.1! (Figure 8). In such case, if the minuend be greater than the subtrahend, and the operation pass through zero into negative quantities; the wire da becomes active, and the solenoids 0.1la', 0.1la", 0.11", 0" to which circuit be completed at the relays 0.69a, 0.68a, 0.69", C. 69, retract their plungers, on receiving impulse through the wire 20, and selectively effect compensation for transitional carry over at the respective shafts and orders to which they correspond. Should the subtrahend be smaller than the minuend and the operation fail to pass through zero, then circuit 01' the wire da remains open and the solenoids inert.

Conversely, if a negative minuend be involved, the relay 0.68 (Figure 8) is active, closing circuit of the wire da to the solenoids 0.1011, 0.10a", 0.10", 0.10, if a greater negative subtrahend be subtracted, the operation passes through zero into positive quantities, and the wire da becoming active causes selected solenoids 0.10a', 0.10a", 0.10, 0.10", to effect compensation. If the subtrahend be smaller than the minuend; the operation does not pass through zero into positive quantities, and, the circuit do remaining open, last said solenoids will fail to act.

In the circuit of the wire 20 is the relay 0.12 (Figures 1 and 8) whose circuit is as follows: ZZ, s+, 0.12, so, conductor 315, s, ZZ. Each impulse transmited through the wire 20 at the termination of an operation, causes the relay 0.12 momentarily to break at the bridge carried by its plunger, circuit of the wire dsto the negative poles of the relays 0.61, 0.68, and also to the relays 0.60a', 0.66a", on", on, causing those thereof which may be active, to break all'circuits thereby closed. The circuit oi the wire ds-- is, however, immediately restored, at the disk 16 revolving breaks the circuit of the wire so. It it is, for example, the relay 0.61 which so releases its plunger before an accumulated quantity is reduced to zero; the wire d still being closed at the disk 63a imparts again initial impulse to the relay 0.61 which again is placed in stick. At the same moment the relays 0.66s", 0.69s, 0.682.069", likewise deenergized, will again be thrown into stick by the wire 2d, preparatory to a future computation. If, on the other hand, all orders be at zero, circuit of the wires d, d, 2d are. open, and the said relays are disabled.

II, when a minuend be positive and the relay 0.61 be active, the operation pass through zero to a negative remainder; then, when circuit of the wire ds be renewed at the bridge of the relay 0.12, circuit d to the positive pole of the relay 0.61 falls. For on passing through zero into negative quantities, the wire 11 is open and the wire d is closed. In such case, however, the relay 0.68 receives an initial impulse through the wire d and is thrown into stick, closing circuit of the wire do at bridge 3l0' raised. The relays 0.69a, 0.60:1", 0.66", 0.66, are, as before, thrown into stick by impulse through the wire at; and such thereof as remain active when an operation pass back through zero into positive quantities, complete circuit through the wire do to their corresponding solenoids 0.160", 0.164, 0.10", 0.10, by which compensation is in turn selectively eil'ected, by displacement of members at the difl'e'rent orders in opposite direction to that eifected when an operation of subtraction passes through zero from positive into negative quantities.

Should a disk such for example as 686w pass through its zero position while the wire 'zd be closed; circuit to the relay 0.66:1" is sustained, through the conductor 30la'. But it the disk 63a pass to zero, as the disk 3l9a' pass from zero; circuit is broken through the wire ed to the relay 0.6011", before the disk 3l6a'" be sufficiently displaced, to close circuit to the relay 0.69s" through the conductor I66a.

Ewamples (g) 93-212=-119. The tens order of the circuit controller at shaft 68a is displaced from zero as the disk 63a passes to zero. The tens order of the accumulator does not reach zero. At neither the circuit controller nor the accumulator does the units order reach zero. At the circuit controller members are displaced in degree proportionate to the numerals 219. The

placed in degree proportionate to the numerals 92. The accumulator reflects the quantity -182. At neither circuit controller nor accumulator is there compensation at the tens order. At both circuit controller and accumulator compensation is effected in the hundreds order.

I! circuit be completed during compensation, through an active wire (1 or d, .to the transfer clutches 0.8", C.8"', or through an active wire do or dc, to the transfer clutches 0.8a", C.8a;

said clutches to which circuit be so completed, eiiect compensation by transfer in orders next above.

(i) 2-1l1- 109. At neither circuit controller nor at accumulator, does the units order reach zero. The tens order of the circuit controller reaches zero with the disk 63a; and relay Ctlla is deenergized. The tens order at the accumulator passes from zero with the disk 83a; and the relay 0.69 is inactive. The circuit controller is displaced in degree proportionate to the numerals 169. The accumulator reflects the quantity 1l. in the tens order of the circuit controller, compensation is attested through the relay 059a" and the solenoid Cilia". In the hundreds order of the circuitcontroller the relay Glitia' and solenoid Cilia are deenergized; but compensation is efiected by the transfer clutch Gta" which is energized by the wire do, as the 'said clutch Cil a" is displaced by the solenoid Cilia. At the accumulator, compensation is effected in the tens order by the solenoid Cfli" circuit to which is closed by the relay Chit".

(7') 306-5Ei5=-l 9. At neither the circuit controller nor the accumulator does the units order reach zero. lit the circuit controller the tens order does not reach zero. At the accumu later, the tens order rests at zero as the disk the passes to zero; and the relay (3.69 is da energized. The circuit controller is displaced degree proportionate to the numerals 199. The accumulator reflects the quantity -2Q9. At the circuit controller compensation is efiected in the hundreds order through the relay Calm and solenoid Cilia and in the tens order through the relay 6.6%" and the solenoid Clio". At the accumulator compensation is effected in. the tens order through the relay (3.69" and solenoid C1 i At the hundreds order of the accumulator, the relay @169 is deenergized and circuit to the solenoid Cfii remains open. But as the operation passed through zero, circuit oi the wire d became active; and when. the transfer clutch Cit, which is at zero, is displaced by the solenoid CIH" during compensation, the said clutch CB effects subtractive transfer at the accumulator in the hundreds order.

Were, as an example, the positive quantity so to be subtracted from the positive Quantity 30, the wire at would operate until the minuend were reduced to zero; and the negative remainder -20 would then be accumulated, as circuit is closed on the wire d, by adding the twenty units negative remainder, without mechanically subtracting from orders thereabove. In other words, on passing through zero, the mechanical operation of addition is substituted for the mechanical operation of subtraction and vice versa, the subtraction of an excess in a positive subtrahend being mechanically effected, by the addition of a negative quantity to zero, and not by the subtraction of a positive quantity. Were the quantity -50 subtracted from the quantity -30; the accumu lator at the shaft 58 rotated in positive direction, would reduce the negative minuend to zero by subtraction, and accumulate the positive remainder +20 by an operation in the nature of addition, when current is switched at the conductor 80 irom the wired to the wire d.

When the net displacement of the accumulator arms 6|, 8|", 8| (Figures 1, 10, and 11) is clockwise, reflecting thereby a positive quantity, their step displacements read from zero to the right. When their net displacement is in the opposite direction reflecting a negative quantity, their step displacements read from zero to the left. The quantities so reflected may be suitably recorded by mechanism which now may be dcscribed.

Referring to Figure 10, a typical accumulator arm Si is shown carrying at its upper extremity the contact 231, in the orbit of which, as said accumulator arm be revolved, are the terminals 238 -2238 of the respective numeral wires cf -ci to which the contact 23'! may selectively close circuit, according to the angular displace ment of the accumulator arm 6|. The accumulator arms iii", (Figures 3. and i1) are similar in construction and in. operation to the accumulator arm and similarly close circuits to the wires si -cf. Encircling the sleeves 6t,

68", tii', at the base of the accumulator arms ti, iii", ti', and wired respectively to the con tacts 223i", 23'2", are the conductors Mt, are", Zid (Figures 18 and ill permanent contact with the terminals of the respective wires t if, tf, which extend from ihred terminals at the disk 226i, and on. which circuit may be successively closed from the wire s+, by a cost ductor 262 fixed to the disk Edi, when the said dish he revolved, as presently described. The wires di -of to which circuit may be closed by the contacts till, till", till, extend over bridges of the relay Grill, to the respective solenoids div-Edit.

The resultant is reflected in the angular dic placement of the accwnulator arms ti, ti", ili; as they severally close, at the termination of a mathematical operation, circuit through the selective numeral wires ai -of, to the soleno ds Ott -C48 which are operative in. re-= cording corresponding numerals oi the resultant.

The plunger of the solenoids CJiiW-Ctt, are respectively connected by means of draw-wires 228228 with the bell-cranks E2Q22$ which in turn, connected by the draw-wires 2520 430 as Well known to the art, with the pivoted type-bars NH -23H. The said typebars 23i23i carry at their upper extremities the types 232 -432 corresponding to the numerals 0-9. When energized by circuits closed at the accumulator arms 6!, 6i", ti, and presently traced; the solenoids corresponding to the selected circuits, retract successively their plungers, each throwing its corresponding type 232 -432 against a platen 236 and printing thereby upon a suitable medium 235, the numeral corresponding to the type. The type bars may be immediately restored to normal position, when circuit to their corresponding solenoids is interrupted, by springs not shown, in manner well known to the art.

The platen 236 (Figure 11) is shown as mounted on the carriage 295 which travels on the roller bearings 296, 296. The said platen may be manually displaced aga nst a spring not shown, and its position adjusted in manner common to a typewriter platen and well known to the art. Fixed to the carriage 295 is a rack 294 which meshes with the gear 258 fixed together with the disk 26I on the shaft 251.

At the termination of a mathematical operaticn, the platen 238 may be manually so ad- Justed, that the disk 26I, revolved by the rack 260, and, the gear wheel 268, carries the conductor 262 to a position at the left of the ti, ti", ti terminals, as shown in Figure 11. The lever 228 is now closed on the terminals 240' of the wire s+; and theplaten is released to the left, and permitted to travel by any suitable means such as the well-known letter spacing bar 282, escapement dog 288, and rack 204, causing, thereby, the disk 26I to advance the conductor 262 step by step into positions at which it closes circuit of the wire s+ successively on the terminals of the wires if, if", and t,f".

Assume that an accumulated resultant were the positive quantity 358; and the accumulator arms III, M", 6I"' respectively closed circuit on the wires of (Figure 10),,af, and of. The circuit closed by the conductor 262 and the accumulator arm 6|, originates at the soure ZZ and extends through s+ bridged at 240', 262, t 216', M, of, bridged at relay 0.41 to solenoid 0.48 s-, ZZ. The solenoid 0.48, so energized retracts its plunger and causes the numeral 3 to be recorded at the platen 236. The circuit closed by the conductor 262 and the accumulator arm 6|", originates at the source ZZ and extends through s+, bridged at 240', 282, tf", 216", 6|", n1 bridged at 0.41, 0.48 s, ZZ. The solenoid 0.48 so energized causes the numeral 5 to be recorded at the platen 236. The circuit closed by the conductor 262 and the accumulator arm 6I', originates at the source ZZ, and extends through 's+ bridged at 240', 262, tf', 276', 6I, af bridged at 0.41, 0.48", s, ZZ. The solenoid 0.48 so energized causes the numeral 8 to be recorded at the platen 236.

If the quantity accumulated be negative the step displacements of the accumulator arms 6|, 6|", 6I" must be enumerated from zero to the left, since complementary numerals become the measure ofresultant. To render such complementary numerals mechanically available, the wires af'--af which normally extend to the solenoids 0.48 0.48 are switched by the relay 0.41 to the solenoids 0.48 0.48 of complementary serial number. The circuit of of" remains undisturbed. For example, circuit of the wire of which normally leads over the highest bridge at the relay 0.41 to the solenoid 0.48 is switched over the lowest bridge at the relay 0.41, to the solenoid 0.48, and the circuits of wires a -M are similarly switched to solenoids 0.48 -0.48 of complementary serial number. The relay 0.41 is energized and automatically switches the circuits of said wires al -417, when a negative quantity be latent at the accumulator, and circuit of the wire it is closed by the conductor at the disk tity and the solenoid 0.64 is inactive; the black' margin of the ribbon 233, is exposed to the types 232 -432 and the quantity is recorded in black. When the resultant is a negative quantity, 0.64 is energized by circuit of the wire (1', and contracting its plunger, places the inking ribbon 233 in such position that the types 232--232 descend upon its red margin and record the quantity in red.

Restoration of 'the calculating unit to zero position Depression of the push-button R6 (Figure '1) closes a circuit which originates at the source 22 (Figure 1) and passes through the .wire s+, the bridge at the push-button P.5 (Figures 1, 2), the

' wire n to the relay 0J8, circuit being closed from as presently described, and to terminals at the relay 0.I2'. The circuit of the relay 0.20 originates at the source ZZ, and extends through the wire s+ bridged at R5 to wire n, bridged at C." to 0.20, s-, ZZ. The relay 0.20 so energized, breaks, at the bridge I61, circuits through the wire it to prevent interference of circuit with the wire n. At the bridge I61, raised, circuit is closed to terminals at the plunger of the relay 0J2, through the wire n.

The relay 0.I2' determines direction of motion at the shafts 58, 58a, during restoration of the calculating mechanism to zero position. The positive pole of the relay 0.l2' is connected with the wire d. If, when restoration to zero position be initiated, a positive quantity be latent at the shaft 58, circuit of wire 11' is open at the conductor 90 (Figures 2, 3); and the relay 0.I2' closes at the bridges I05, I06, depressed, circuit through the wires n, n. to the negative and positive poles of the clutch 0.50, and motion of the shaft 58 is opposite to clockwise. If .a quantity latent at the shaft 58 be negative; the wire at is active as hereinbefore described, and ener-' gizes over the bridges 92 I04, the relay 0.I2', which is then held in stick over the bridge I04 by current through the wire n". The initial circuit closed to the relay 0.I2 through the wire 11', is ZZ, s+, 90, d bridged at 92 and I04 to 0.I2', nover the lower bridge raised at the relay 0. I9 to s, ZZ. The circuit which then retains the relay 012 in stick after receiving initial impulse through circuit of the wire d, is ZZ, s+, I12 (Figures 1 and 7), n bridged at I61 raised to n, 0.I2', n-, lower bridge raised at 019, s-, ZZ. The relay 0.I2' so energized, closes at the bridges I05, I06 raised, circuit to the clutch 0.5; and clockwise motion follows at the shaft 66.

Responsive to the clutch 0.6, and floating on the shaft 58, is-the armature 69 (Figures 1, '7) which carries a conductor I12, extending, except at a slight arc, throughout the circumference of the disk. Momentary depression of the pushbutton P.5 imparts initial impulse to the clutches 0.5 or 0.5a and 0.6. The clutch 0.5 or 0.511 revolving, transmits motion to the shafts 58, 58a

, and the clutch 0.6 clutching and revolving the disk 69 causes the conductor I 12 to close a circuit from the wire s+, extended from the source ZZ and connected with the wire n, which holds the relays 0J9, 0.20 in stick, and sustains current to the clutches 0.5 or 0.5a and 0.6, after the initial impulse imparted through the push button P5. The conductor I12 (Figure 7) is of such are as to sustain current throughout a single revolution of the shaft 58, this being suflicient to restore to zero position, the displaced members of the accumulator and circuit controller (Figures 1 and 2).

The initial circuit (Figure 2) closed as above by R6 to 0.6, is ZZ, s+, PJ, n, upper bridge raised at C.I and bridge I61 raised to n' bridged at I06 raised to 0.5, nbridged at I06 raised and lower bridge raised at C.I9 to s--, ZZ. The corresponding circuit closed by R6 to 0.6a is ZZ,-3+, P5, n,

. upper bridge raised at C. and bridge I61 raised,

n bridged at I06 depressed to 0.5a, nbridged at I06 depressed, and lower bridge raised at 0.I0 to s-, ZZ. Initial circuit closed to 0.6 (Figure 1) is ZZ, s+, P.5, n, upper bridge raised at 018, bridge I68 raised to 0.6, n-, lower bridgeraised at C.I9, 8-, ZZ. The circuit closed to the clutch 0.5 by the conductor I12 (Figures 1 and '1) after the initial impulse through R5 is ZZ, s+ bridged by conductor I12 to extension of wire 11 bridged at I60 raised to n bridged at I05 raised to 0.5,

nbridged at I06 raised and lower bridge raised at C.I9 to s, ZZ. Corresponding circuit closed by I12, to 0.5a, is ZZ, s+ bridged at I12 to extension of wire 12 bridged at I68 raised to n bridged at I05 depressed to 0.5a, nbridged at I06 depressed and lower bridge raised at C.I9 to 8-, ZZ. Circuit closed by I12 to 0.6 is ZZ, s+ bridged at I12 to extension of wire n bridged at I68 to 0.6, nbridged at C.I9 to s-, ZZ.

The clutches 0.1, C.1, 0.1, 0.1a, 0.1a,

0.1a (Figures 1 2) are active, in restoring to zero position the accumulator arms SI, 6 I 6 I and such other members at the shafts 58, 58a, as may be displaced. The clutches 0.1, 0.1, 0.1, are energized to restore members on shaft 58, by circuits of the wire n which pass respectively, over the bridges Ill, I10, I69 at the relay 0.20 (Figure 1) and the similar conductors I13, I13", I13' (Figure 6). The conductor I13 (Figures 1, 6) is carried by the middle member of the planetary gearing D1". The conductor I13" is carried by the middle member of the planetary gearing Di; and the conductor l13 is carried by the member 62". Circuit of wire at to the clutch 0.1 originates at the source ZZ, and extends through s+ bridged by 812 (Figures 1 and '1) to extension of wire 11. bridged at ill and 613, to 0.1, s, ZZ. Circuit to 0.1" is ZZ, s+ bridged by I12 to extension of n bridged at I10 and I13" to 0.1", s, 22; Circuit to 0.1" is ZZ, 8+ bridged at E12 to extension of n bridged at I69 and I13" to 0.1, s, ZZ. The operation at all orders is substantially alike. Referring to Figure 6, the conductor Ilt', for example, extends throughout the circumference of the member 82 except at a slight are, at which, if the member 62" and the accumulator arm Bi' be already at zero position, circuit is open to the clutch 0.1 (Figure 1). If the accumulator arm iii" and the member 62" be displaced; circuit is completed through the conductor I13" to the clutch 0.1", which clutching, in manner hereinbefore described, the member 62, transmits motion to the member 62", until circuit to the clutch 0.1 be broken at the conductor "3", as the accumulator arm 6I and the member 62" reach zero. The accumulator arms 6I, BI, are

' restored to zero position, by the circuits above- 6). are carried by the disk 62a', and by the middle members of the planetary gearings Dfa", Dla'. which break circuit respectively to the clutches 0.10", 0.1a", 0.1a, as the sleeves 60a'", 60a", 60a and the transfer clutches 0.0a, 0.0a", 0.0a thereon mounted are restored to zero position. Circuit so closed to the clutch 0.1a (Figure 2) is ZZ, s+ bridged by I12 to extension of n bridged at I1Ia and I130. to 0.1a, s-, ZZ. Corresponding circuit to 0.1a" is ZZ, s+ bridged by I12 to extension ofn bridged at H011 and Him to 0.1a", s, ZZ. Corresponding circuit to C.1a" is ZZ, s+ bridged by I12 to extension of n bridged at I68a and I13a' to 0.1a, s-, ZZ.

During restoration to zero, circuit to the clutches 0.8", 0.8", 0.8a", C.8a, through the wire ds-- is broken at the lower bridge at the relay 0A9, and the carry-over mechanism is inactive, except the clutch 0.8a whose negative pole is connected with the wire s-, and which restores to normal position the armature 630.

I claim:

1. In a calculating apparatus for computing quantities whether positive or negative in quality,

' an accumulator comprising members corresponding to denominational orders and operative in respective positive and negative directions to accumulate positive and negative quantities, means selectively to operate the members in positive direction either to add a positive quantity to anv accumulated positive quantity or to subtract a negative quantity from an accumulated negative quantity, or to operate the members in negative direction either to add a negative quantity to an accumulated negative quantity or to subtract a positive quantity from an accumulated positive quantity, reversible transfer mechanisms of convertible first and tenth step cyclic phases between the several orders of said members, and operative by the members of next respective lower order, means automatically to convert said phases ac cording to the quality of the accumulated quantity and the directional operation of said members, to cause the transfer mechanisms to transmit tens carry-over in the addition or" a quantity to an accumulated quantity similar in quality at .each tenth step, and to borrow at each cyclic first step in the subtraction of a quantity from an accumulated quantity similar in quality, whether the quality of the quantities component in the computations is positive or negative.

2. In a calculating apparatus for computing quantities whether positive or negative in quality, an accumulator comprising members corresponding to denominational orders operative step by step from zero position in respective positive and negative directions to accumulate positive and negative quantities, means selectively to operate the members in positive direction either to add a positive quantity to an accumulated positive quantity or to subtract a negative quantity from an accumulated negative quantity, or to operate the members in negative direction either to add a negative quantity to an accumulated negative quantity or to subtract a positive quantity from an accumulated positive quantity, reversible transfer mechanisms of. convertible first and tenth step cyclic phases differentially convertible according to the directional operation of said members and the quality of the accumulated quantity, between the several orders of said members, means automatically to convert the said phases to condition the said mechanisms to transmit tens carry-over in the addition of a quantity to anaccumulated quantity'simllar in quality at eachtenth step, and to borrow at each cyclic first stepin the subtraction of a quantity from an accumulated quantity similar in quality, the last said means includingvan electric clutch in each saidtransfer mechanism operative by the said members of respectivevnext lower order, in directions corresponding to the directional operation or said members, dual circuits to the clutches corresponding to the respective positive or negative quality of the accumulated quantity, a circuit controller comprising members corresponding to denominational orders of which the highest order is denominationally higher than the highest order of the accumulator members, transfer mechanism between the several orders of the circuit controller members of first and tenth step cyclic phases to operate cyclic first step transfer coincidentally with the initial step of the first operated accumulator member from zero position in either direction, to close, at the highest order of the circuit controller members, the circuit corresponding to the quality of the quantity accumulated by the accumulator during said initial step. 3. In a calculating apparatus for computing quantities positive and negative in quality, an accumulator operative through zero comprising members corresponding to denominational orders and operative in respective positive and negative directions to accumulate positive and negative quantities, means selectively to operate the members in positive direction either to add a positive quantity to an accumulated positive quantity or to subtract 9. negative quantity from an accumulated negative quantity, or to operate the members in negative direction either to add a negative quantity to an accumulated negative quantity or to subtract a positive quantity from an accumulated positive quantity, reversible transfer mechanisms of first and tenth step cyclic phases convertible according to the directional operation of said members and the quality of the accumulated quantity between the several orders of said members and operative by the members of respective next lower order in directions corresponding to the directional operation of said members, to transmit tens carry-over in the addition of a quantity to an accumulated quantity similar in quality at each tenth step and to borrow at each cyclic first step, in the subtraction of a quantity from an accumulated quantity similar in quality, whether the component quantities computed be positive or negative, and means automatically to convert the phases of the transfer as the accumulator passes through zero from positive into negative quantities or vice versa, and cause the direction in which the transfer mechanisms transmit tens carry-over and the direction in which said mechanisms borrow, each respectively to be reversed.

4. In a calculating apparatus for computing quantities positive and negative in quality, an accumulator operative through zero comprising members corresponding to denominational orders operative step by step from zero position in respective opposite directions to accumulatepositive and negative quantities, means selectively to operate the members in positive direction either to add a positive quantity to an accumulated positive quantity or to subtract a negative quantity from an accumulated negative quantity, or to operate the members in negative direction either to add a negative quantity to an accumulated negative quantity or to subtract a positive quantity from an accumulated positive quantity, reversible transfer mechanisms of-first and tenth step cyclic phases convertible according to the directional operation of the mechanisms and the quality or theaccumulated quantity, between the several orders of said members, an electric clutch in each said transfer mechanism operative by the members of next respective lower order in directions corresponding to the directional operation of said members, dual circuits corresponding to the respective positive or negative quality of the accumulated quantity to condition the said clutches, a circuit controller operative coincidentally with the initial step from zero position of the first operated accumulator member in either direction, to close the said circuit corresponding to the qualityof the quantity accumulated by the accumulator during said initial step, and cause the transfer mechanisms in the accumulator to transmit tens carry-over in the addition of a quantity to an accumulated quantity similar in quality at each tenth step and to borrow at each cyclic first step in the subtraction of a quantity from an accumu- Y lated quantity similar in quality, and means when the accumulator passes through zero from positive into negative quantities or vice versa and the quality of the accumulated quantity changes, to cause the circuit controller to break the first said circuit and close the other circuit, automatically to convert the phases of the transfer andcause the direction in which the transfer'mechanisms in the accumulator transmit tens carry-over in addition and the direction in which last said mechanisms borrow in subtraction each respectively to be reversed.

5. In a calculating apparatus for performing computations in quantities positive and negative in quality involving transitional carry-over, an accumulator operative through zero comprising members corresponding to denominational orders and operative step by step from zero position in respective positive and negative directions to accumulate positive and negative quantities, means selectively to operate the members in positive direction either to add a positive quantity to an accumulated positive quantity or to subtract a negative quantity from an accumulated negative quantity, or to operate the members in negative direction either to add a. negative quantity to an accumulated negative quantity or to subtract a positive quantity from an accumulated positive quantity, reversible transfer mechanisms of first and tenth step cyclic phases convertible according to the directioal operation of said members and the quality of the accumulated quantity, between the several orders of the members and operative. by the members of next respective lower orders in directions corresponding to the direction l operation of said members, and automatic means to compensate the orders of the accumulator members which may be affected by transitional carry-over as the accumulator passes through zero from positive into negative quantities or vice versa.

6. In a calculating apparatus, an accumulator operative through zero from positive into negativequantities or vice versa and comprising members corresponding to denominational orders operative from zero position in respective positive members in negative direction either to add a negative quantity to an accumulated negative quantity or to subtract a positive quantity from an accumulated positive quantity, reversible transfer mechanisms of first and tenth step cyclic phases convertible according to the directional operation of said members and the quality of the accumulated quantity, an electric clutch in each said mechanism operative by the said members of respective next lower order in directions corresponding to the directional operation of said members, dual circuits to the clutches corresponding to the respective negative or positive quality of the accumulated quantity, a circuit controller operative coincidentally with the accumulator members to close the said circuit corresponding to the quality of the first accumulated quantity, and as the accumulator passes through zero, to break the last said circuit and close the other circuit to the clutches to convert the transfer phases and cause the direction of operation in which the transfer mechanisms transmit tens carry-over and the direction in which the said mechanisms borrow, each respectively to be reversed.

7. In a calculating apparatus for computing quantities whether positive or negative in quality, an accumulator comprising members corresponding to denominational orders, operative step by step in respective positive and negative directions to accumulate positive and negative quantities, means selectively to operate the members in positive direction either to add a positive quantity to an accumulated negative quantity or subtract a negative quantity from an accumulated positive quantity, or to operate the members in negative direction either to add a negative quantity to an accumulated positive quantity or to subtract a positive quantity from an accumulated negative quantity, reversible transfer mechanisms of con vertible first and tenth step cyclic phases between the several orders of said membs and operative by the members of next respective lower order, and means automatically to convert said phases according to the quality of the accumulated quantity and the directional operation of said members to cause the said transfer mechanisms to transmit tens carry-over in the subtraction of a quantity from an accumulated quantity dissimilar in quality at each tenth step and to borrow at each cyclic first step in the addition of a quantity to an accumulated quantity dissimilar in quality thereto.

8. In a calculating apparatus for computing in quantities whether positive or negative in quality, an accumulator comprising members corresponding to denominational orders operative step by step from zero position in respective positive and negative directions to accumulate positive and negative quantities, reversible transfer mechanisms of first and tenth step cyclic phases differentially conditioned according to the directional operation of said members and the quality of the accumulated quantity, between the several orders of said members, a clutch in each transfer mechanism operative by the said members of next respective lower order in directions corresponding to the directional operation of said members, dual circuits to the clutches respectively corresponding to the positive or negative quality of the accumulated quantity, a circuit controller comprising members corresponding to denominational orders of which the highest order is denomina tionally higher than the highest order of the circuit controller members, transfer mechanisms in the circuit controller of first and tenth step cyclic phases controlled by the circuit controller members of next respective lower order and operative coincidentally with the initial step of the first operated accumulator from zero position, to cause by first cyclic step transfer the highest order of the circuit controller members to close the said circuits corresponding to the quality of the quantity accumulated by the accumulator during said initial step, and an adjustable statecontrol to predetermine the directional operation of said accumulator members and conjointly with the circuit controller condition the transfer mechanisms in the accumulator differentially to operate transfer of the different phases 9. In a calculating apparatus for computing quantities whether positive or negative in quality, an accumulator comprising members corresponding to denominational orders operative step by step from zero position in respective positive and negative directions to accumulate positive and negative quantities, reversible transfer mechanisms of first and tenth step cyclic phases between the several orders of the accumulator members differentially conditioned according to the directional operation of said members and the quality of the accumulated quantity, a clutch in each transfer mechanism operative by the said members of next respective lower order in directions corresponding to the directional operation of said members, dual circuits to the clutches respectively corresponding to the positive or negative quality of the accumulated quantity, a circuit controller comprising members corresponding to denominational orders of which the highest order is denominationally higher than the highest order of the circuit controller members, transfer mechanisms in the circuit controller of first and tenth step cyclic phases controlled by the circuit controller members of next respective lower order and operative coi icidentally with the initial step 01' the first operated accumulator member from zero position, to cause by first cyclic step transfer the highest order of the circuit controller members to close the said circuit corresponding. to the quality of the quantity accumulatod by the accumulator during said initial step, and an adjustable state-control to predetermine the directional operation of said accumulator members and conjointly with the circuit controller condition the transfer mechanisms in the accumulator differentially to operate transfer of the different phases.

HENRY JEWE'I'I FURBER. 

